Air-pump.



PATENFTED JUNE'25, 19.07

AIR PUMP.

APPLIOATIOH FILED AUG. 30. 1902.

( o Mia ATTORN YS.

. eratin necte 'sltion in alinement the d and the FRANK E. TEN EYOK, or AUBURN, NEW YORK.

AIR-PUMP.

To all whom it may concern:

Be it knownthat I, FRANK E. TEN EYoK, of Auburn, in the county of Cayuga, in the State of New York, have invented new and useful Improvements in Air-Pumps, of which th the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

his invention relates to improvements in air pumps, being particularly applicable for inflating heavy neumatic tires-as used for automobile wheels.

One of the objects of this invention is to produce a hand operated air ump in which the leverage increases as t e air is compressed, or in other Words, to connect the operating lever in such manner that its fulcrum moves gradually from a position remote from the axis of the piston rod to a poe with or slightly beyond said axis when the piston is in-its compressed position, thereby locking the piston against re-v action by the elasticity of the com ressed air.

.Another objectis to relieve t e cylinder from any strain-by connecting the the operating lever to a suitable hlCh the'cylinder is mounted. A further object is to provide the outlet passage-of the cylinder with a suitable check valve to prevent the re-entrance of the compressed air from the pneumatic tire back into the cylinder. a

To this end the invention consists in the combination, construction and arrangement of the parts of an air pump as hereinafter fully described and pointed out in the claims. Referring to the drawings-Figure 1 is an elevation of my improved air pump, the oplever and link and the piston contheretobeing shown in their elevated positions in full lines and in their intermebase upon Specification of Letters Patent. Application filed August 30,

fulcrum of Patented June 25, 199 7. 1902. Serial No. 121,617.

UNITED STA S rA Nr onion.-

1 having lower and upper end heads 2 and -3, the lower head -2.- bein of greater area than the head 3- an forms a suitable su porting base upon which e various parts oi niy invention are mounted either directlyor indirectly.

The cylinder l receives suitable piston '5 having a rod 6- projecting u wardly therefrom through an opening in tne head 3 and is uided in a bushing 7- removably secured in the opening in the usually threaded.

The lower end of the cylinder '1- is preferture --8 in the upper end of the base -2-,. This base is formed with a lateral chamber l communicating with the interior of the cylinder l' at apoint beneath the piston, one of the walls. of the lateral chamber ];O b

let opening in which is removably secured a nipple 11. This nipple forms one of the features of my. invention, being provided with a lengthwise valve seat 13forreceiv1ngaval;ve -14 which operates to close the passage -l2 againstthe re-en rance of the compressed air from the inflated tire back into the cyldiate and extreme downward position bydotted lines.

evice seen in Fig. 1, the operating levers parts-connected thereto being shown in their lowermost position. Fig. 3- is a transverse vertical sectional view through thedevice, as seen in Fig. 2. Fig. 4 is a horizontal sectional view taken on line 44c, Fig. 1. Fig. is a vertical sectional view of the detached bushing or nip la in which th outlet assa e and valve arelbcated.

Fig. 2 is. a front elevation of,

. Smn ar re -erence characters indicate corre-,

sponding parts in all the views. I In carrying out the objects of my invention, I preferably employ an upright cylinder sage -12 communicates with the chamber and that the nipple 11 is provided with a projecting end having engaging shoulders for receiving one end of a pneumatic tube not shown, which tube, how- .ever, is usually employed in connection with an air pump for conducting the compressed air to t e tire to be inflated.

The base 2- is usually formed of cast Pivotally connected to the lugs 15- by a suitable pivotal bolt -l 7- is alink extendin upwardly from the pivot -17 beyond t eupper end'ofthe .'3- and is provided with a lateral off set "-21 which overhangs the upper end of the cylinder when pressed position.

head :3, said opening and bushing being passage l2 and a cylinder head the piston is inits def erably threaded and engages a threaded apeing provided with an outinder, it being understood that the pasv metal and is ,provided with an annular foot 14C and upwardly projecting ears or lugs I -15 rising from the flange 1fi' and. preferably cast integral with the base, the

are

. limit of its downward movement as actuated The upper end of the piston rod 6- is provide with av bifurcated head 22 to W ich is pivoted bya suitable bolt 23 a hand operated lever '24, said lever 24 being fulcrumed to the upper end of the link ,'-20, or rather to the free end of the offset ,ortion 2 1 byapivotal bolt .2 and t e free end of this lever is provided with a recess -2 6 in its end face in which is seated a handle 27, projecting laterally in opposite directions from the adjacent portion of the leverand is held' in position by a clamping bolt 28 engaged with the threaded socket 28 in the end of the lever.

he arm of the lever provided with a bandle 2 7 is considerably longer than the distance between the ivotal bolts '23 and so as to a 0rd as great leverage as possible ino crating the piston and in order to effect the ull movement of the-piston and to obtain the utmost compressive force in the easiest and most-efficient manner this lever is of suchconstru etion that the fulcrum gradually moves toward the axis of the piston rod during thedescent of the piston so that the 'leveragp and therefore the power. exerted upont e piston gradually increased as the resistance of the air increases and at the same'time the longer arm-of the lever assumes aposition below the horizontal'level of the plvotal bolts 23 and -25 and permits the operator to bring his whole weight and strength to bear u on the further downward movement of the ever, and therefore upon the piston. When the piston approaches the by the lever 2 0 the fulcrum 2 5 moves slightly beyond the axis of the piston rod, and

therefore automatically locks the piston from reactionary movement due to the elasticity of the compressed air. In order to accomplish these results'the lever -24 is provided with lateral oflsets 29- and 30- "at opposite sides of the pivotal bolt 23 somewhat in the form of a letter S-. The particular forms of link 20- and lever 24..are important features in my invention for the reason that by constructing said parts 20 and 24 with the offsets --21 and -.-29 I am enabled to diminish materially the distance between.the pivotal connections -23- and 25 as compared with the distance from the bolt 23 to the handle .27, thereby obtaining a fargreater owerthan would be possible with a straight ink. The lever is movable through an arc of substantially half a circle or nearly 180 so as to give the greatest possible movement to the piston in a single stroke of the lever and the distance between the fulcrum and pivotal connection of the leverwith the piston. rod is therefore substantially equal to half the stroke of the piston, while the long arm of the lever may be, and isin this instance, fully as long as the cylinder.

A feature of advantage of disposing the arm 30 of the lever at an angle with its intermediate portion, is that I am enabled to move the lever closely to the base of the cylinder and more directly under the weight of the operator at the period of greater resistance to compression.

Another important advantage of the particular connection of the link -20 with the base 2+ is that the cylinder proper is relieved from any torsional or lateral strain during the act of com ressing the same, such as would occur ifthe ink were connected directly to the cylinder or to the upper head.

It is apparent from the foregoing description that during the operation of compressing the air in the cylinder in advance of the piston, the action of the lever is from a minimum to a maximum leverage, that is, the fulcrum moves from its extreme remote position from the axis of the piston rod in its starting position to a position directly over and slightly beyond said axis at which time the piston is moved to the full limit of its downward stroke.

The main cylinder -1 is .preferably formed of tubing, and the heads 2 and 3 are preferably formed of cast metal, these parts being threaded and screwed to each other and therefore affords a simple and economical means of assembling said parts.

The operation of my invention will now be readily understood upon reference to the foregoing description and the accompanying drawing.

Having thus described my invention what I claim and desire,.to secure by Letters Patent is I A device of .the character described comprising a cylinder, a base, said base extending substantially half way across the bottom of said cylinder, and having an enlarged portion forming a chamber wholly within said base, a piston operating in said chamber, a link pivoted to said base, and a handle pivoted to one extremity of said. link at its own extremity and pivoted to said piston at a point between its two extremities,-said handle and said link so formed as to conform to the upper 

